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Net Income per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 03, 2015
Sep. 27, 2014
Oct. 03, 2015
Sep. 27, 2014
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]        
Net income attributable to CRA International, Inc. $ 2,860 $ 3,224 $ 8,964 $ 9,822
Less: net income attributable to CRA International, Inc. allocated to unvested shares (22)   (69)  
Net income attributable to CRA International, Inc. allocated to common shares; and basic earnings per common share 2,838   8,895  
Add: net income attributable to CRA International, Inc. allocated to unvested shares. 22   69  
Less: net income reallocated to unvested shares (21)   (66)  
Net income attributable to CRA International, Inc. allocated to common shares; and diluted earnings per common share $ 2,839   $ 8,898  
Weighted Average Number of Shares Outstanding, Diluted [Abstract]        
Net income attributable to CRA International, Inc. allocated to common shares (in shares) 9,008,000   9,125,000  
Less: net income attributable to CRA International, Inc. allocated to unvested shares (in shares) (68,000)   (70,000)  
Net income attributable to CRA International, Inc. allocated to common shares; and basic earnings per common share (in shares) 8,940,000 9,729,000 9,055,000 9,892,000
Dilutive effect of non-participating share-based awards (in shares) 85,000   127,000  
Net income attributable to CRA International, Inc. allocated to common shares; and diluted earnings per common share (in shares) 9,025,000   9,182,000  
Income (Loss) from Operations before Extraordinary Items, Per Basic Share [Abstract]        
Net income attributable to CRA International, Inc. allocated to common shares; and basic earnings per common share (in dollars per share) $ 0.32 $ 0.33 $ 0.98 $ 0.99
Net income attributable to CRA International, Inc. allocated to common shares; and diluted earnings per common share (in dollars per share) $ 0.31 $ 0.33 $ 0.97 $ 0.98
Reconciliation of basic to diluted weighted average shares of common stock outstanding        
Basic weighted average shares outstanding 8,940,000 9,729,000 9,055,000 9,892,000
Diluted weighted average shares outstanding 9,025,000 9,919,000 9,182,000 10,018,000
Calculation of common stock equivalents for purposes of computing diluted weighted average shares outstanding        
Anti-dilutive securities excluded from EPS computation (in shares) 431,992 319,564 398,382 831,975